KOYO (JTEKT) 6303-2RZ

Deep groove ball · 2Z shield

The seat — 17 MM × 47 MM × 14 MM

Bore

17 MM

Outside dia

47 MM

Width

14 MM

Type

Deep groove ball

Seal

2Z shield

Clearance

Precision

ABEC-1 (P0)

Dynamic C

13.5 kN

Static C0

6.5 kN

63 other designations in the catalogue share this bore × outside diameter × width. Each was compared on the four fields every bearing row carries — Type, Seal, Clearance, Precision — as recorded, case- and separator-insensitively. All four agreeing puts a designation in the first list; anything else, a difference or a blank, puts it in the second with the fields named.

Candidates at the recorded dimensions above

May substitute — 11 designations

Part number	Manufacturer	C	C0
6303-2ZNR	NTN	14.3 kN	6.5 kN
6303-Z	NTN	14.3 kN	6.5 kN
6303 2ZJEM	NTN	14.3 kN	6.5 kN
6303.2ZR	FAG (Schaeffler)	13.6 kN	7.0 kN
6403.2ZR	FAG (Schaeffler)	13.6 kN	7.0 kN
303KDD	Timken	13.5 kN	6.5 kN
6303-2Z	NTN	13.5 kN	6.5 kN
6303ZZ	NTN	13.5 kN	6.5 kN
6403-2Z	NTN	13.5 kN	7.0 kN
6403ZZ	NTN	13.1 kN	6.7 kN
W 6303-2Z	NTN	11.7 kN	6.5 kN

Check before substituting — 52 designations · top 12 shown

Part number	Manufacturer	C	Differs from this part
NJ 303 ECP	NTN	28.5 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2Z shield
NU 303 ECP	NTN	28.5 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2Z shield
QJ 303 LA/P63	NTN	23.4 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2Z shield
7303 BE-2RZP	NTN	15.9 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2Z shield
7303 BECBP	NTN	15.9 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2Z shield
7303 BEGA-2RZP	NTN	15.9 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2Z shield
7303 BEGAP	NTN	15.9 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2Z shield
7303 BEP	NTN	15.9 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2Z shield
6303 ETN9/C3	NTN	15.6 kN	Seal: Open — this part: 2Z shield Clearance: C3 — this part: CN
7303 B.TVP	FAG (Schaeffler)	14.7 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2Z shield
7303	Timken	14.5 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2Z shield
6303-2RSH/C3	NTN	14.3 kN	Seal: Open — this part: 2Z shield Clearance: C3 — this part: CN

What this sheet is — and what the catalogue did not say

The envelope is recorded dimensions only: the same bore, outside diameter and width. Every designation above shares all three, or it would not be on this page.
The four compared fields are Type, Seal, Clearance, Precision. Two recorded spellings were counted to mean one value and are read as one: CN/Normal = CN, and ABEC-1/P0 = P0. A third precision spelling, P0/Class4, is deliberately not equated with either — the catalogue's meaning for it has not been sourced, so it lands in the warnings where both spellings are printed for the reader to judge.
A blank is a difference. Missing is the absence of the proof, not the proof.
Cage material and ring material are never compared: the catalogue records neither, on any bearing row.
Suffixes the catalogue does not record separately — a snap ring (NR) and anything else outside those four fields — are not compared, and this sheet does not claim they match.
Ranking is recorded dynamic load, strongest first, with an unrecorded rating ranked last. It orders the lists; it is not a verdict.
Compiled from catalogue records. This is not a manufacturer interchange list, no manufacturer has confirmed any line on it, and it does not know what job the bearing is doing. Verify before fitting.

Anyone with this link can view this part and its recorded candidate comparison.

BEARINGBRAIN.COM/PART/6303-2RZ/SUBSTITUTE